模态弹出扩展器在.Show（）之后自动关闭

I am using ModalPopupExtender from AjaxToolkit for asp.net. I am trying to have a ModalPopupExtender triggered with different buttons. The problem is that unless I am using the TargetControlID the popup opens and quickly closes within under a second. I need this popup to be accessible by several different buttons with the same panel being used everytime.I am using ModalPopupExtender from AjaxToolkit